* {{cite book | last=Nevins | first=Allan | title=Ordeal of the Union | publisher=Scribner | publication-place=New York : Toronto : New York | date=1992 | isbn=978-0-02-035445-1}}
<ref name="y606">{{cite book | last=Nevins | first=Allan | title=Ordeal of the Union | publisher=Scribner | publication-place=New York : Toronto : New York | date=1992 | isbn=978-0-02-035445-1 | page=}}</ref>